On Fri, Feb 08 2013, Glauber Costa wrote:
> Without the surrounding infrastructure, this patch is a bit of a hammer:
> it will basically shrink objects from all memcgs under memcg pressure.
> At least, however, we will keep the scan limited to the shrinkers marked
> as per-memcg.
>
> Future patches will implement the in-shrinker logic to filter objects
> based on its memcg association.
>
> Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
> Cc: Dave Chinner <dchinner@xxxxxxxxxx>
> Cc: Mel Gorman <mgorman@xxxxxxx>
> Cc: Rik van Riel <riel@xxxxxxxxxx>
> Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxx>
> Cc: Hugh Dickins <hughd@xxxxxxxxxx>
> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> ---
> include/linux/memcontrol.h | 16 ++++++++++++++++
> include/linux/shrinker.h | 4 ++++
> mm/memcontrol.c | 11 ++++++++++-
> mm/vmscan.c | 41 ++++++++++++++++++++++++++++++++++++++---
> 4 files changed, 68 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 0108a56..b7de557 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -200,6 +200,9 @@ void mem_cgroup_split_huge_fixup(struct page *head);
> bool mem_cgroup_bad_page_check(struct page *page);
> void mem_cgroup_print_bad_page(struct page *page);
> #endif
> +
> +unsigned long
> +memcg_zone_reclaimable_pages(struct mem_cgroup *memcg, struct zone *zone);
> #else /* CONFIG_MEMCG */
> struct mem_cgroup;
>
> @@ -384,6 +387,11 @@ static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
> struct page *newpage)
> {
> }
> +
> +static inline unsigned long
> +memcg_zone_reclaimable_pages(struct mem_cgroup *memcg, struct zone *zone)
> +{
return 0;
> +}
> #endif /* CONFIG_MEMCG */
>
> #if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM)
> @@ -436,6 +444,8 @@ static inline bool memcg_kmem_enabled(void)
> return static_key_false(&memcg_kmem_enabled_key);
> }
>
> +bool memcg_kmem_is_active(struct mem_cgroup *memcg);
> +
> /*
> * In general, we'll do everything in our power to not incur in any overhead
> * for non-memcg users for the kmem functions. Not even a function call, if we
> @@ -569,6 +579,12 @@ memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
> return __memcg_kmem_get_cache(cachep, gfp);
> }
> #else
> +
> +static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg)
> +{
> + return false;
> +}
> +
> #define for_each_memcg_cache_index(_idx) \
> for (; NULL; )
>
> diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
> index d4636a0..a767f2e 100644
> --- a/include/linux/shrinker.h
> +++ b/include/linux/shrinker.h
> @@ -20,6 +20,9 @@ struct shrink_control {
>
> /* shrink from these nodes */
> nodemask_t nodes_to_scan;
> +
> + /* reclaim from this memcg only (if not NULL) */
> + struct mem_cgroup *target_mem_cgroup;
> };
>
> /*
> @@ -45,6 +48,7 @@ struct shrinker {
>
> int seeks; /* seeks to recreate an obj */
> long batch; /* reclaim batch size, 0 = default */
> + bool memcg_shrinker;
>
> /* These are for internal use */
> struct list_head list;
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 3817460..b1d4dfa 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -442,7 +442,7 @@ static inline void memcg_kmem_set_active(struct mem_cgroup *memcg)
> set_bit(KMEM_ACCOUNTED_ACTIVE, &memcg->kmem_account_flags);
> }
>
> -static bool memcg_kmem_is_active(struct mem_cgroup *memcg)
> +bool memcg_kmem_is_active(struct mem_cgroup *memcg)
> {
> return test_bit(KMEM_ACCOUNTED_ACTIVE, &memcg->kmem_account_flags);
> }
> @@ -991,6 +991,15 @@ mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
> return ret;
> }
>
> +unsigned long
> +memcg_zone_reclaimable_pages(struct mem_cgroup *memcg, struct zone *zone)
> +{
> + int nid = zone_to_nid(zone);
> + int zid = zone_idx(zone);
> +
> + return mem_cgroup_zone_nr_lru_pages(memcg, nid, zid, LRU_ALL);
Without swap enabled it seems like LRU_ALL_FILE is more appropriate.
Maybe something like test_mem_cgroup_node_reclaimable().
> +}
> +
> static unsigned long
> mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
> int nid, unsigned int lru_mask)
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 6d96280..8af0e2b 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -138,11 +138,42 @@ static bool global_reclaim(struct scan_control *sc)
> {
> return !sc->target_mem_cgroup;
> }
> +
> +/*
> + * kmem reclaim should usually not be triggered when we are doing targetted
> + * reclaim. It is only valid when global reclaim is triggered, or when the
> + * underlying memcg has kmem objects.
> + */
> +static bool has_kmem_reclaim(struct scan_control *sc)
> +{
> + return !sc->target_mem_cgroup ||
> + (sc->target_mem_cgroup && memcg_kmem_is_active(sc->target_mem_cgroup));
Isn't this the same as:
return !sc->target_mem_cgroup ||
memcg_kmem_is_active(sc->target_mem_cgroup);
[...]
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